Photographic camera



May 19, 1936,. Q BARNACK 2,041,633

FHOTOGRAPHI C GAMER A Filed Feb. 4, 1955' i/v VEN T0 1e A TTORNE Y Patented May 19, 1936 UNITED STATES 2,011,633 PHOTOGBAPHIC CAMERA Oskar Barnack, Wctzlar, Germany, assignor to Ernst Leitl G, m. b. 11., WetzlanGermany Application February 4, 1935, Serial No. 4,811

In Germany February 5, 1934 i 1 Claim. (01. 95- 44) This invention relates to improvements in photographic cameras, and it is the principal object of my invention to provide an ottaccnt to enable the taking of pictures oi objects which are very close to the camera, and the distance of which cannotbe measured by the commonly used distance meter u Another object of my invention is the provision of a camera attachment inclug on in= termediory mounting between the camera and the customary objective to which the objective mounting is secured preferably by means of a bayonet loch.

A further object of invention h the prois vision of an intermediary objective mounting or attachment for photographic cameras which is held there by means oi o ring and which, actuates the lever oi the distance meter,

A still further object of my invention is the so provision of a camera. uttuchment including an intermediary mounting between comers and objective mounting and the arrangement of o prism in a suitable mounting in iront oi the distance meter windowin order to compensate for the length of the intermediary mount to allow the mes of distances of'objects very close to the corners.

These and other objects and advantages of my invention will become more fully known as the description thereof proceeds and will then be specifically defined in the appended claim.

In the accompanying drawing forming a material part of this disclosure: 7

. The single figure illustrates a photographic camera. constructed according to my invention,

partly in section, part of the camera housing being broken away to show the interior arrangement.

As illustrated, a camera i in which a. distance meter including its mirrors 2 and i4 is coupled or engaged with the curve 8 oi the objective mounting by a roller 9 in the manner as for instance illustretedin patent application, Serial No. 629,763 filed August 22, 1932, and copending, has a threaded opening IS in its wall for the reception of the threaded part of an exchangeable intermediary mounting 6.

A threaded ring I isinterposed between the threaded wall of the camera opening and the 50 mounting & is provided with a bayonet holder or look 5 for the attachment of the objective mounting 3 for; exchangeable objectives of varying focus equipped with the usual adjustment srrangement 4. l

The windows for the distance meter are designated H l2 and i3, and in front of the window H a glass prism or wedge II) is arranged in a suitable mounting to compensate for the length of the mounting 6. 5

In use, ii? it is desired to take pictures of objects which are very close to the camera and which; cannot be reached with the usual objective adjustment and measurable distance of for instance 1 meter, the intermediary mounting 6 id is inserted into the camera and held therein by means of the ring I and is ehgaged by and acts on the lover of the distance meter in the mannor as shown in my above mentioned copending patent application. is

By means of the bayonet holder or look 5 the objective mounting for exchangeable objectives 7 is attached to the mounting i5, and in order to compensate for the length of the mounting 6 and to lower the distance to be measured by the distunce meter to about 40 cm, a glass prism or wedge m is placed before the window ii of the distance meter in a. suitable mounting.

It will be understood that I have described and shown the preferred form of my invention only as one example of the many possible ways to practically construct the some, and that I may make such. changes in its general arrangement and in the construction of the minor details thereof as come within the scope of the sp- 30 pended claims without departure from the spirit of my invention and the principles involved.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: 35

In a camera including its distance meter hav ing a plurality of windows, a lever for said dis tance meter and objective mounting, an intermediary threaded mounting, a threaded ring socuring said intermediary mounting to the cam- V era, a cam face on said intermediary mounting, a, roller on the lever 01' the distance meter adapted to be engaged by said cam face, an exchangeable objective mounting, a bayonet lock adapted to lock said objective mounting to said intermediary member, and a prism in a. suitable mounting arranged with its base in front of one of the windows of the distance meter to compensate for the length of soldv intermediary mounting to allow the measuring or the distance of an object very close to the camera.

OSKAR BARNACK. 

